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cttue.de

Checked 2026-10-21 22:11 UTC · first added 2026-10-21

✗Problems found Score 69 of 100

Domain & DNS

warn

19 passed 3 warn 0 failed

Areas

iRegistration iDelegation iNameservers !SOA !DNSSEC !Records

Problems

!

Unusual SOA timers

SOA · negative caching TTL (minimum) 3m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 8h, retry 2h, expire 14d, negative TTL 3m.

#23
!

Not signed

DNSSEC · The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.

#27
!

Very low TTLs

Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (3m), AAAA (3m), MX (3m), NS (3m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 3m; resolvers may use either.

#32

Recent checks

!

Full report

Domain & DNS report for cttue.de ›

Mail

fail

16 passed 4 warn 1 failed

Areas

✓SPF ✗DMARC !DKIM !DNSSEC !MX !TLS iBIMI

Problems

✗

No DMARC record

DMARC · No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.

#5
!

No key under common selectors

DKIM · The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.

#7
!

Not enabled

DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

#8
!

Hosts without IPv6

MX · The following MX hosts could not be resolved to IPv6 addresses: mail.cttue.de

#11
!

Not configured

TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.

#32

Recent checks

✗

Full report

Mail report for cttue.de ›